nix/tests/functional/lang/eval-okay-tojson.nix

builtins.toJSON {
  a = 123;
  b = -456;
  c = "foo";
  d = "foo\n\"bar\"";
  e = true;
  f = false;
  g = [
    1
    2
    3
  ];
  h = [
    "a"
    [
      "b"
      { "foo\nbar" = { }; }
    ]
  ];
  i = 1 + 2;
  j = 1.44;
  k = {
    __toString = self: self.a;
    a = "foo";
  };
}